American Heritage® Dictionary of the English Language, Fourth Edition
- n. A line on a weather map connecting points of equal atmospheric pressure. Also called isopiestic.
- n. Any of two or more kinds of atoms having the same atomic mass but different atomic numbers.
Century Dictionary and Cyclopedia
- n. In physical geography, a line connecting places on the surface of the globe at which the barometric pressure is the same. For places not situated at the sea-level, a correction must be applied to each barometric observation corresponding to the elevations of the stations, before the isobar connecting such stations can be drawn. Isobars may be purely imaginary lines; but generally, that the distribution of the pressure may be seen at a glance, they are drawn upon some kind of map or chart of the regions covered by the observations. Isobars may be such as indicate the distribution of barometric pressure at a certain specified day and hour, or they may give the mean pressure for any period of time, as for the entire year or for the summer or winter months. Also called
- n. In thermodynamics, a line or curve determined by the equation of state (pv = RT) of a system when p has any constant value; a line of equal pressures.
- n. meteorology A line drawn on a map or chart connecting places of equal or constant pressure.
- n. nuclear physics Either of two nuclides of different elements having the same mass number.
- n. thermodynamics A set of points or conditions at constant pressure.
GNU Webster's 1913
- n. (Phys. Geog.) A line connecting or marking places upon the surface of the earth where height of the barometer reduced to sea level is the same either at a given time, or for a certain period (mean height), as for a year; an isopiestic line.
- n. (meteorology)an isogram connecting points having equal barometric pressure at a given time
- From Ancient Greek ἴσος (isos, "equal") + βάρος (baros, "weight") (Wiktionary)
- iso- + Greek baros, weight; see gwerə-1 in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
“I call it “isotropic platting” after the “isobar”.”
“I took a quick glance at the barograph, and at the isobar chart of the day before.”
“The marine component includes the open sea between these islands up to limit of the isobar of 40 m depth.”
“And worse, a 48-hour prediction put the tight hoops of isobar lines that signaled the storm right in the path of the fleet.”
“If a line were drawn through all points on the surface of the earth having an equal barometric pressure at the same time, such a line would be called an isobar.”
“The weather has been variable, with cryptoconchoidal deflections of a solid reverberating isobar previously tested in a solution of zinc and soda-water.”
“Now, Mr. Tighe, you can see from the map that the barometric pressure, the isobar, running through this part of the country shows a barometric pressure of 30.30.”
“Now, if you look at the map, Mr. Tighe, you'll see that the isobar for this region shows a barometer pressure of 29.50, a terrific drop of four points in twenty-four hours.”
“Jeff squints, takes a deep breath, and stares deeply into the late afternoon sky, turning his head - perhaps mentally overlaying computer-generated graphics onto the swirling clouds, time-lapse isobar gradients and Doppler bands to help form his decision.”
“For more information about Isobar North America, please visit www. isobar.com.”
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